This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “Graphics”.
1. What is the purpose of the canvas element?
a) Creates drawing surface
b) Exposes powerful drawing API to client-side JavaScript
c) Creates drawing surface & Exposes powerful drawing API to client-side JavaScript
d) None of the mentioned
View Answer
Explanation: The canvas element has no appearance of its own but creates a drawing surface within the document and exposes a powerful drawing API to client-side JavaScript.
2. From which version of IE is canvas supported?
a) 7
b) 8
c) 9
d) Not yet supported
View Answer
Explanation: The canvas element is not supported by IE before IE9, but it can be reasonably well emulated in IE6, 7, and 8.
3. Which method is used to obtain the “drawing context” object ?
a) getContext()
b) getObject()
c) get()
d) getDrawing()
View Answer
Explanation: Most of the Canvas drawing API is defined not on the canvas element itself, but instead on a “drawing context” object obtained with the getContext() method of the canvas.
4. What is the returning value of the getContext() method?
a) Drawing model
b) CanvasRenderingContext2D object
c) Context2D object
d) None of the mentioned
View Answer
Explanation: Call getContext() with the argument “2d” to obtain a CanvasRenderingContext2D object that you can use to draw two-dimensional graphics into the canvas. It is important to understand that the canvas element and its context object are two very different objects.
5. How does SVG describe complex shapes?
a) Path of lines
b) Path of curves
c) Path of lines and curves
d) None of the mentioned
View Answer
Explanation: SVG describes complex shapes as a “path” of lines and curves that can be drawn or filled.
6. Which is the method invoked to begin a path?
a) begin()
b) path()
c) createPath()
d) beginPath()
View Answer
Explanation: The beginPath() is used to begin a new path.
7. Which is the method invoked to connect the last vertex back to the first?
a) closePath()
b) close()
c) connectlast(first)
d) none of the mentioned
View Answer
Explanation: The closePath() method connects the last vertex back to the first, thereby creating a path.
8. Which of the following are not the properties of a canvas object?
a) fillStyle
b) strokeStyle
c) lineWidth
d) lineSize
View Answer
Explanation: There is no property called lineSize associated with the canvas object.
9. Which of the following is a property used to check how crisp or fuzzy shadows are?
a) shadowColor
b) shadowBlur
c) strokeStyle
d) none of the mentioned
View Answer
Explanation: shadowBlur is used to check how crisp or fuzzy shadows are.
10. How do you restore a saved coordinate system?
a) restore()
b) getback()
c) set()
d) none of the mentioned
View Answer
Explanation: The saved coordinate system is restored by calling the method restore() associated with the canvas object.
Sanfoundry Global Education & Learning Series – Javascript Programming.
